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<title>omp_unset_nest_lock (GNU libgomp)</title>

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Next: <a href="omp_005fdestroy_005fnest_005flock.html" accesskey="n" rel="next"><code class="code">omp_destroy_nest_lock</code> &ndash; Destroy nested lock</a>, Previous: <a href="omp_005ftest_005fnest_005flock.html" accesskey="p" rel="prev"><code class="code">omp_test_nest_lock</code> &ndash; Test and set nested lock if available</a>, Up: <a href="Runtime-Library-Routines.html" accesskey="u" rel="up">OpenMP Runtime Library Routines</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Library-Index.html" title="Index" rel="index">Index</a>]</p>
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<h3 class="section" id="omp_005funset_005fnest_005flock-_002d_002d-Unset-nested-lock"><span>3.45 <code class="code">omp_unset_nest_lock</code> &ndash; Unset nested lock<a class="copiable-link" href="#omp_005funset_005fnest_005flock-_002d_002d-Unset-nested-lock"> &para;</a></span></h3>
<dl class="table">
<dt><em class="emph">Description</em>:</dt>
<dd><p>A nested lock about to be unset must have been locked by <code class="code">omp_set_nested_lock</code>
or <code class="code">omp_test_nested_lock</code> before.  In addition, the lock must be held by the
thread calling <code class="code">omp_unset_nested_lock</code>.  If the nesting count drops to zero, the
lock becomes unlocked.  If one ore more threads attempted to set the lock before,
one of them is chosen to, again, set the lock to itself.
</p>
</dd>
<dt><em class="emph">C/C++</em>:</dt>
<dd><table class="multitable">
<tbody><tr><td width="20%"><em class="emph">Prototype</em>:</td><td width="80%"><code class="code">void omp_unset_nest_lock(omp_nest_lock_t *lock);</code></td></tr>
</tbody>
</table>

</dd>
<dt><em class="emph">Fortran</em>:</dt>
<dd><table class="multitable">
<tbody><tr><td width="20%"><em class="emph">Interface</em>:</td><td width="80%"><code class="code">subroutine omp_unset_nest_lock(nvar)</code></td></tr>
<tr><td width="20%"></td><td width="80%"><code class="code">integer(omp_nest_lock_kind), intent(inout) :: nvar</code></td></tr>
</tbody>
</table>

</dd>
<dt><em class="emph">See also</em>:</dt>
<dd><p><a class="ref" href="omp_005fset_005fnest_005flock.html"><code class="code">omp_set_nest_lock</code> &ndash; Wait for and set nested lock</a>
</p>
</dd>
<dt><em class="emph">Reference</em>:</dt>
<dd><p><a class="uref" href="https://www.openmp.org">OpenMP specification v4.5</a>, Section 3.3.5.
</p></dd>
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